#include #include //i am not using std here to make library without "using" //using namespace std; //example for filling simple class without constructor class A { public: //important int i1, i2; }; //example for filling simple struct without constructor struct B { float f; }; //complex example to create object with items //with private Item struct template class Object { struct Item { std::string name; T value; }; std::string _name; std::vector _items; public: Object(const std::string &name, const std::initializer_list &items) : _name(name), _items{items} {} void debug() { std::cout << _name << ": " << std::endl; for (const Item &item : _items) std::cout << "\tname = " << item.name << "; " "value = " << item.value << std::endl; } }; void testA(A a) { std::cout << "testA: " << "i1 = " << a.i1 << ", " "i2 = " << a.i2 << std::endl; } void testB(B b) { std::cout << "testB: " << "f = " << b.f << std::endl; } int main() { //initializer creates A class testA( {1, 2} ); //initializer creates B struct testB( {1.0} ); std::cout << "======" << std::endl; //initializer creates initializer_list of private struct Object objectInts("Object of ints", {{"one", 1}, {"two", 2}, {"three", 3}}); objectInts.debug(); std::cout << "======" << std::endl; //a bit easier to see items Object objectStrings("Dungeon party", { {"Harry", "Adventurer"}, {"Bobby", "Archer"}, {"Megan", "Sorcerer"} }); objectStrings.debug(); return 0; }

Initialization examples with private struct